chore: update dev dependencies

[corwinm]

chore: update dev dependencies

📝 Description

This PR updates the project's dev dependencies and refreshes the lockfile to keep the toolchain current. It also adds targeted pnpm overrides for transitive mocha dependencies so dependency audit issues can be resolved without mixing in unrelated VS Code test-runner changes.

🔧 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• ♻️ Code refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Tests (adding missing tests or correcting existing tests)
• 🎨 Style changes (formatting, missing semi-colons, etc)
• 🔧 Chore (maintenance tasks, dependency updates)
• 🌟 Other (please describe):

🔗 Related Issues

• N/A

Testing

• I have tested this change locally
• I have added/updated unit tests
• All existing tests pass

Screenshots (if applicable)

N/A

Checklist

• My code follows the project's coding standards
• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked my code and corrected any misspellings

Additional Notes

Local validation completed with pnpm run check-types and pnpm run lint. pnpm test is currently blocked by an upstream VS Code download endpoint returning 503 responses during @vscode/test-electron setup.